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From my research:

Vice Adm. Thomas Wilson, director of the Defense Intelligence Agency, wrote to all DIA personnel this week to explain the protest resignation of a DIA analyst in October. The analyst, Kie Fallis, quit the day after the USS Cole was attacked by suicide bombers in Aden, Yemen. Mr. Fallis charged that a report he had written on the threat of a terrorist attack in Yemen was suppressed by senior DIA officials.
Mr. Fallis' resignation letter stated that he had "significant analytic differences" with DIA superiors over a terrorist threat assessment produced in June.
U.S. intelligence officials said there were warnings, but they arrived too late. The National Security Agency issued a report shortly after the Cole was bombed warning of attacks in the region —too late to be useful.
Adm. Wilson said he asked the Pentagon inspector general (IG) to investigate Mr. Fallis' charges. In an awkwardly worded statement, the three-star admiral said on Wednesday the IG "found no evidence to support the public perception that information warning of an attack on Cole was suppressed, ignored or even available in DIA." What about the private perception?
The admiral's statement drew smirks from several intelligence officials. It relied on a dodge often used by intelligence analysts to dismiss unwelcome information. Saying there is "no evidence" —like that presented to a court of law — is often used to mask the fact there is lots of intelligence to the contrary that spooks would rather not talk about in public.
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